let user: {name:String,age:number,school:String} = {
    name:"Bob",
    age:16,
    school:"xtu",
};

let market={
    name:"零食工厂",
    price:"lower",
    count:"more",
};
market.isAdmin="true";
delete market.isAdmin;
for(let key in market){
    console.log(key);
}
console.log(Object.keys(market));
console.log(Object.values(market));
console.log(Object.entries(market));
Object.assign(user,market);
console.log(Object.entries(user));
// for(let key in user){
//     console.log(key);
// }